I have never heard of anyone saying “ch” variety.
Yichusdik — You are somewhat correct that there is (and has been) a trend to move north into Thornhill (both Vaughan and Markham) as well as Richmond Hill.
However, you should know that there is also a trend for younger couples to move south (St. Clair/Bathurst/Spadina area), a bit closer to the downtown core.
And I have noticed a continuous stream of people who have bought real estate in the Bathurst & Sheppard Avenue, resisting the temptation to migrate north of Steeles Avenue.
All of the above is based on observation (of the frum community).